Ladies and gentlemen please fasten your seat belts.The plane .A. takes off B. has taken

问题补充：

Ladies and gentlemen, please fasten your seat belts.The plane .

A. takes off

B. has taken off

C. is taking off

D. took off

答案：

A. takes off

B. has taken off

(答案→)C. is taking off

D. took off

解析：考查时态，本题中考查的是现在进行时代替将来时，现在进行时代替将来时表示的是按照事先安排好的事情，且动词必须是一些表示位置变化的动词。本题均符合。句意：先生们，女士们，请系好安全带，飞机马上就要起飞了。故C正确。